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The changing role of fire in conifer-dominated temperate rainforest through the last 14,000 years

Citation

Fletcher, M-S and Bowman, DMJS and Whitlock, C and Mariani, M and Stahle, L, The changing role of fire in conifer-dominated temperate rainforest through the last 14,000 years, Quaternary Science Reviews, 182 pp. 37-47. ISSN 0277-3791 (2018) [Refereed Article]


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DOI: doi:10.1016/j.quascirev.2017.12.023

Abstract

Climate, fire and vegetation dynamics are often tightly coupled through time. Here, we use a 14 kyr sedimentary charcoal and pollen record from Lake Osborne, Tasmania, Australia, to explore how this relationship changes under varying climatic regimes within a temperate rainforest ecosystem. Superposed epoch analysis reveals a significant relationship between fire and vegetation change throughout the Holocene at our site. Our data indicates an initial resilience of the rainforest system to fire under a stable cool and humid climate regime between ca. 12-6 ka. In contrast, fires that occurred after 6 ka, under an increasingly variable climate regime wrought by the onset of the El Niņo-Southern Oscillation (ENSO), resulted in a series of changes within the local rainforest vegetation that culminated in the replacement of rainforest by fire-promoted Eucalypt forest. We suggest that an increasingly variable ENSO-influenced climate regime inhibited rainforest recovery from fire because of slower growth, reduced fecundity and increased fire frequency, thus contributing to the eventual collapse of the rainforest system.

Item Details

Item Type:Refereed Article
Keywords:pollen, charcoal, rainforest, Tasmania, El Nino-Southern Oscillation (ENSO), superposed epoch analysis (SEA)
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Palaeoclimatology
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Effects of Climate Change and Variability on Australia (excl. Social Impacts)
Author:Bowman, DMJS (Professor David Bowman)
ID Code:129088
Year Published:2018
Deposited By:Plant Science
Deposited On:2018-11-08
Last Modified:2018-11-09
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